Mark Cuban Bulls,
The NBA is a multibillion-dollar corporation that requires lots of
travel for each team, and so it's not surprising that each franchise
either owns or contracts out a private plane for the season. Athletes
need comfort to allow their bodies to recuperate, and there's no way to
do that by flying commercial. Plus, can you imagine if a team on a tight
schedule had to depend on the rampant delays of commercial airlines?The
problem here is that NBA teams really depend on their planes, so when
one breaks down it becomes a major issue that needs a quick fix. On
Saturday night, the Chicago Bulls had some mid-air plane trouble on
their way to Indianapolis to face the Pacers. They returned to Chicago
and borrowed the plane of the still-undefeated Chicago Blackhawks, but
that was only a short-term solution.

So, when they needed a plane, they called on a member of their NBA competition. From ESPNChicago.com:

Dallas
Mavericks owner Mark Cuban lent the Bulls the Mavs' plane to fly to San
Antonio on Tuesday and to return after Wednesday's game. Bulls forward
Lou Amundson tweeted his appreciation to Cuban for the lift.